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NCP1501 Datasheet(PDF) 7 Page - ON Semiconductor |
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NCP1501 Datasheet(HTML) 7 Page - ON Semiconductor |
7 / 14 page NCP1501 http://onsemi.com 7 Voltage Output Selection The output voltage selection is accomplished via two external pins: CB0 and CB1. If CB0 and CB1 pins are left floating by the external circuit, the output voltage will default to 1.35 V. The corresponding voltages are as follows. NCP1501 CB0 CB1 Vout (V) 0 0 1.05 0 1 1.35 1 1 1.57 1 0 1.80 Figure 6. Transition Waveforms from LDO to PWM Mode Vin 0 3.0 0 010 External SYNC Signal Internal CLK Signal TIME (m) 1.35 V Figure 7. Power Up and Power Down Sequence 1.8 V 1.05 V 1.57 V Vin SHD VO CB0 CB1 Thermal Shutdown Internal Thermal Shutdown circuitry is provided to protect the integrated circuit in the event that the maximum junction temperature is exceeded. When activated, typically at 160 °C, the PWM latch is reset and the linear regulator control circuitry is disabled. The thermal shutdown circuit is designed with 25 °C of hysteresis. This means that the PWM latch and the regulator control circuitry cannot be re−enabled until the die temperature drops by this amount. This feature is provided to prevent catastrophic failures from accidental device overheating. It is not intended as a substitute for proper heatsinking. The NCP1501 is contained in the Micro−8 package. |
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